Gram motor speed indicator disk scans - UK Vintage Radio Repair and Restoration Discussion Forum

Paul Stenning · 7th Feb 2021, 12:57 pm

This cardboard is disk approx 12cm diameter, published by Bernards and cost 10p back in the 70s.

It relies on the slight flicker of filament lamps to give the strobe effect, 50Hz one side and 60Hz the other side.

Scans attached, 600DPI.

hansomcommon · 14th Oct 2021, 9:24 am

Thank you Paul, I was looking for a disk speed scan!

majoconz · 16th Oct 2021, 11:05 pm

Works very well under one of those confounded CFL desk lamps - thanks Paul.

Sideband · 17th Oct 2021, 10:37 pm

They work very well under a neon lamp as well

Graham G3ZVT · 23rd Oct 2021, 12:34 pm

I recently found mine languishing in a drawer.

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paulsherwin · 23rd Oct 2021, 2:24 pm

Quote:

Originally Posted by majoconz

Works very well under one of those confounded CFL desk lamps - thanks Paul.

Be careful with CFLs or LEDs though - they may not strobe at 50Hz, depending on the power supply arrangements. A traditional fluorescent should be OK though.

Avinunca · 13th Feb 2023, 9:30 pm

The VinylEngine website is a good place to find these and apps are available for smartphones to use with them.

GeraldSommariva · 19th Aug 2023, 6:38 pm

good information , help me with my speed problem

14th Oct 2021, 9:24 am	#2
hansomcommon Pentode Join Date: Jan 2014 Location: Alton, Hampshire, UK. Posts: 170	Re: Gram motor speed indicator disk scans Thank you Paul, I was looking for a disk speed scan!

16th Oct 2021, 11:05 pm	#3
majoconz Heptode Join Date: Jan 2008 Location: Ashhurst, Manawatu, New Zealand Posts: 564	Re: Gram motor speed indicator disk scans Works very well under one of those confounded CFL desk lamps - thanks Paul. __________________ Cheers - Martin ZL2MC

17th Oct 2021, 10:37 pm	#4
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,435	Re: Gram motor speed indicator disk scans They work very well under a neon lamp as well __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....

23rd Oct 2021, 12:34 pm	#5
Graham G3ZVT Dekatron Join Date: May 2010 Location: Greater Manchester, UK. Posts: 18,580	Re: Gram motor speed indicator disk scans I recently found mine languishing in a drawer. __________________ -- Graham. G3ZVT

13th Feb 2023, 9:30 pm	#7
Avinunca Tetrode Join Date: Nov 2019 Location: Shrewsbury, Shropshire, UK. Posts: 70	Re: Gram motor speed indicator disk scans The VinylEngine website is a good place to find these and apps are available for smartphones to use with them.

19th Aug 2023, 6:38 pm	#8
GeraldSommariva Pentode Join Date: Mar 2021 Location: Liphook, Hampshire, UK Posts: 111	Re: Gram motor speed indicator disk scans good information , help me with my speed problem